She ordered and EKG and and echocardiogram--normal, of course, cuz I was at rest. I asked her to lower my
dose, but instead she switched me to the same
dose of
Levoxyl. That did it. My dose was increased since then with no problems.
I am not lactose-intolerant, and I have no idea what was in the Synthroid that sent my heart into arrythmia, but I have not had a problem since switching to Levoxyl. I've been on 100 mcg of Levoxyl for over 10 yrs now.